Default Koreader setting work to me
You can choose a book cover or a custom image as screensaver via this menu:
TOP MENU / / Screen / Screensaver
You can use JPG/PNG files as screensaver (properly dithered grayscale images look best). Transfer the files from your computer into any folder on your device. And choose this folder as your screensaver folder via this menu:
TOP MENU / / Screen / Screensaver / Settings
Please refer to this Mobileread forum post for advanced information about preparing screensaver
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